Hypodermic syringe



(No Model.)

, H. HAUSSMANN.

'HYPODERMIG SYRINGE. N0..4*01,950., Patented Apr. 23, 1889.

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UNITED f STATES PATENT' OFFICE.'

HERMANN HAUSSMANN,OF CHICAGO, ASSIGNOR OF"TVOTHIRDS TO SOLA B. DUNN AND JAMES C. MCCOMB, OF COOK COUNTY, ILLINOIS.

HYPoDl-:RMIC sYRINGE.

SPECIFICATION forming part of Letters Patent No. 401,950, dated April 23, 1889.

i Application iiled July 26, 1883. Serial No. 281,135. (No model.)

-To all whom it may concern:

Be it known that l, HERMANN HAUssMANN,

a citizen ofthe UnitedStates, residing in the city of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in l-lypodermic Syringes, of which the following is a' specification.

This invention relates to improvements in hypodermic syringes in which heretofore the uuid-containing tube has been composed lof glass or other frangible material, in connection with which a reciprocating piston is employed for filling the tube and discharging the uid therefrom.

' It iswell known that syringes so constructed are easily injured by accidental contact with harder materials or by dropping to the `iioor or ground, and frequently by the changes have a compressible elastic tube for containing the injecting-fluid, which may be discharged therefrom by compression and the tube relled by the expansion thereof only, whereby all danger of the fracture of the tube is avoided and the necessity for the employment of a piston dispensed with, and to provide suitable mechanism for compressing said tube.

Another object is to combine with such a tube a pressure-roller' for compressing the same,which shall be operated in substantially the same manner as the ordinary pistonthat is, by means of a piston-rod, which may be, if desired, gaged so as to indicate the quantity of liquids injected.

A further object is to have the compress- 'ing-roller mounted in a suitable carriage having a sliding connection with the frame of the syringe, whereby the piston-rod will be re'- lieved of objectionable twisting and friction in its bearing and a uniform pressure exerted upon the tube throughout the length thereof, whereby a vacuum is at all times produced behind the compression-roller and the tube rendered easier to fill and capable of operating to its full capacity. I attain these objects by the devices illustrated in the accompanying drawings, in which- Figure l represents a plan view of a syringe embodying my invention; Fig. 2, a side elevation thereof; Fig. 3, a transverse vertical section on the line 3 3 of Fig. 2, and Fig. 4 a central longitudinal section.

Similar letters of reference indicate the same parts in the several figures of the drawings.

Referring by letter to the accompanying drawings, A indicates a metallic frame-piece or base-plate, the ends B BV of which are upturned at a right angle; and between which extends a compressible tube, C, rigidly secured to the frame-plate at the rear thereof by means of a clamping-plate, D, between which and the frame-plate the end of the tube is compressed and rmly clamped, and the said plate rigidly secured in position by a screw, E, working loosely through the baseplate and tube and engaging the clampingplate about the center thereof, it being immaterial, however, whether one or more screws are employed. Suchaconnection also serves to seal the rear end of the tube against the possible escape therethrough of the fluid contained in the tube. The forward end of the tube is secured in any convenient and well-known manner to a nipple, F, the screwthreaded neck of which works through the forward upturned end B of the frame-plate and projects a sufficient distance beyond said plate to have screwed thereon the usual hollow needle, G, for insertion in the flesh. This nipple is also provided with a central bore, H, which serves as a communicating passage between the tube and the needle, the forward end of the tube being sleeved upon the nipple in such manner as to be at all times eX- panded, 'so as to permit the free escape of the iiuid contained therein. 1

Through the rear upturned end, B of the frame-plate, and above the clamping-plate which secures the rear end of the tube to the frame-plate, loosely works .a piston-rod, I, graduated, if desired, the forward end of which connects with a carriage, J, consisting of an angular metallic frame encolnpassing the tube and frame-plate, the ends K of which are turned under, as more clearly shown in Fig. 3, so as to slide on the under side of the f rame-plate, and thus guide the carriage in its reciprocations. In this carriage is mounted 1o a roller, L, journaled at such a height above the base or frame plate that the contactingsurface thereof will be removed f rom the surface of the frame-plate a little less than the thickness of the two walls of the tube when brought together thereby, so as to tightly compress the tube between the said roller and the base-plate, the ends K of the carriage also serving to maintain the roller in this position at all times. Thus it will be seen that as the 2o carriage moves forward the roller will travel along upon the tube', colnpressing the same 'as it moves forward and expelling the fluid from the instrument during every part of its movement, the compressing force exerted by the roller upon the tube being sufficient to prevent the possibility of air being drawn into the tube, in which there is always a vacuum behind the roller, and as the roller is drawn back to its forward position at the rear 5 end of the tube the elasticity of the tube will cause it to draw in a new supply of liquid, which may be discharged as before and in substantially the same manner as if a piston were used in connection therewith.

The connection between the carriage and the piston-rod, as well. as between the needle and the nipple, is screw-threaded, in order that the nipple and the rod may be removed for greater convenience in transportation. 4o 'lo the rear angled portion, B', of the frame are also attached the finger-pieces N, for convenience of manipulation, as is usual in such devices, the instrument in operation being held so that the lingers engage said pieces,

while the head of the piston-rod bears against the palm of the hand.

In practice I propose to have the tube composed of rubber and covered with an envelope or wrapping of linen, silk, or other fabric,

which will prevent bot-h a stretching'or elongation of the tube and the expansion or bulging thereof beyond its normal size when compressing the fluid contained therein; but my invention is not limited to this particular construction of tubing, for any other material possessing sufficient elasticity and flexibility to expand to its normal size after being compressed may be employed instead and the same end be attained.

Having described my invention, what I claim,and desire to secure by Letters Patent, 1s

l. In a syringe, an elastic compressible tube for containing the injecting-fluid, in combination with mechanism for compressing said tube, substantially as described.

2. In a syringe, a compressible tube for containing the fluid, in combination with a reciprocating roller for compressing said tube, substantially as described.

3. In a syringe, a compressible tube for containing the fluid, in combination with a reciprocating carriage, a roller mounted therein and compressing said tube, and a piston-rod for reciprocating said carriage, substantially as described.

4. In a syringe, the frame-plate provided with the upturned ends, a compressible tube rigidly secured at one end to said plate, a nipple working through one end of said frame, upon which the opposite end of said tube is sleeved, the angular carriage, a sliding connection between said carriage and frame, a roller mounted in said carriage for compressing said tube, and a piston-rod Working loosely through the other upturned end of said frame and secured to said carriage, substantially as described.

5. In a syringe, a compressible tube for containing the liquid, composed of elastic material and having a wrapping or covering of textile fabric, in combination with a reciprocating roller for compressing said tube, substantially as described.

HERMANN HAUSSMANN.

Witnesses:

WILL R. OMOHUNDRO, A. M. BENNETT. 

